Multiple stream traffic emulator

(19)

(11)

EP 0 895 375 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	09.07.2003 Bulletin 2003/28

(43)	Date of publication A2:
	03.02.1999 Bulletin 1999/05

(21)	Application number: 98104193.2

(22)	Date of filing: 09.03.1998

(51)	International Patent Classification (IPC)⁷: H04L 12/26

(84)	Designated Contracting States:
	AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

31.07.1997 US 904188

(71)	Applicant: Agilent Technologies, Inc. (a Delaware corporation)
	Palo Alto, CA 94303 (US)

(72)	Inventor:
	Beanland, Matthew G. Ringwood, Victoria, 3134 (AU)

(74)	Representative: Schoppe, Fritz, Dipl.-Ing.
	Schoppe, Zimmermann, Stöckeler & Zinkler Patentanwälte Postfach 246 82043 Pullach bei München 82043 Pullach bei München (DE)

(54)	Multiple stream traffic emulator

(57) A multiple stream traffic emulator (1) that generates multiple stream packet based traffic pursuant to a selected statistical model under control of a processor (105). A plurality of input data streams can be generated internally by the processor (105) or by an external processing element (108-110). An interdeparture queue (101) is used to store data representative of a selected statistical traffic model, comprising both a pattern of data traffic and a traffic load. A departure scheduler (102) reads this stored data out of the list maintained by the interdeparture queue (101) to identify the temporal relationships of data outputs among the plurality of input data streams. The departure scheduler (102) identifies the desired time of departure of each data packet as well as the selected stream from which the data packet originates. The departure scheduler (102) drives a cell generator (103) that produces and releases the resultant output data stream for transmission to the equipment under test (106).

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